Within 1 minute after sending your text message you will receive a reply with the actual flight information you’ve requested

It is also possible to “track” a flight. This means that by sending 1 sms you will be proactively notified by the system whenever a change of the flight-status will occur. Tracking a flight with your mobile phone is very simple, just send: “klm track” followed by the flight number to 2021. For example: klm track 735.